BIVALVE SHELLS. TJ 



71. DlONE ROSEA. B.M 



D. testa oblique cordata, subcompressa, roseo-purpurascente, 

 concentrice sulcata, antice lamellata, lamellis remotis, postice 

 spinis brevissimis, latiuscuiis, muricata. 



Cytherea rosea, Brod. Sf Sow. Zool. Journ. iv. 364. 



Beechefs Voy. Moll. p. 151. pl. 43. f. 7- 



Hanley, Descr. Cat. p. 104; in Wood, Suppl. pl. 9. f. 11. 



Phil. Abbild. Conch. p. 181. pl. 5. f. 6. 



Sow. Thes. Conch. p. 632. pl. 132. f. 108. 

 Cytherea lepida, Chenu, Conch. Illustr. 



Hab. Panama. 



72. DlONE CIRCINATA. B.M. 



D. testa ovali-subrotundata, ventricosa, alta, alba rubro-radiata, 

 seu omnino pui-purea ; laminis erectis, acutimarginatis, in 

 medio numerosis, ad latera distantioribus, productioribus, con- 

 centrice costata; margine dorsali plerumque purpureo ; lunula 

 distincta, plerumque purpurea. 



Cardium purpurea, Martyn, Un. Conch. ii. pl. 133. 

 Pectunculus ruber, Lister, Conch. pl. 306. f. 139. 

 Venus circinata, Born, Test. Mus. p. 61. pl. 4. f. 8. 



Chemn. Conch. vi. 312. pl. 30. f. 311. 



Dillw. Cat. i. 160. no. 24, exclus. plm\ synon. 



Wood, Ind. pl. 7. f. 24. 

 Aneadem Venus cinerea circinata, Chemn. p. 313. pl. 30. f. 312? 



Encycl. Meth. ^\. '2i!>5. i. \. 

 Venus, nos. 4 & 5, Schrot. Einl. iii. 155. 

 Venus guineensis, Gmel. p. 3270. no. 10. 

 Venus, no. 65, Schrot. Einl. iii. 176? 

 Venus rubra, Chnel. p. 3288. no. 92? 

 Cytherea guineensis, Lamk. An. s. Vert. v. 570. no. 38. 



Hanley, Descr. Cat. p. 100; in Wood, Ind. Sup.^\. 15. f.23. 



Forbes ^' Hanley, Brit. Moll. i. 399. 

 Cytherea alternata, Brod. Proc. Zool. Soc. 1835, p. 45. 

 Chione eircinata, Gray, Cat. Cyth. Anal. viii. 305. 

 Cytherea circinata, Sow. Thes. Conch.-p. 631.pl. 132. f. 104-106. 



Hab. Mare Antillarum ; Colombia occidentalis. 



73. DiONE Cygnus. 



D. testa ovato-transversa, subtrigona, insequilaterah, turgida, cordi- 

 formi, intus extusque alba, anterius obtusa, brevi, posterius sub- 

 angulata, lamelhs tenuibus transversis exasperata ad margines 

 brevioribus ; umbonibus magnis, obliquis ; lunula magna, cor- 

 data, impressa, squalide alba; area excavata, angulo obtuso 



